Avoid snaplock connectors like the plague.
Do not wire it off the radio wiring as it probably isnt suitable, nor is much else on a mini loom unless you want it to go up in flames.
Take a NEW feed off either the starter or the fusebox, if its attached to a live permanently it may be a good idea to have a switch fitted for it.
The earth can go to any good, clean, rust and paint free bodywork of the car.
Heres mine
Switch is to the above left of the 12v sockets, and i adapted a plug in dual socket to be wired up directly.
http://www.theminifo...x...&id=100821/
Edited by Carlzilla, 21 October 2010 - 06:05 PM.